creating instance ip using a subnet-uuid

[Babu Shanmugam]

Right now, the instance IP can not be created using a subnet uuid.
When port-create is requested with '--fixed-ip subnet-id=' option, the vnc_openstack module allocates an IP from the subnet and creates an instance IP with that object. So, if port-create with '--fixed-ip, subnet-id=<subnet-uuid>,ip_address=<ip-address>' where 'ip-address' does not belong to 'subnet-uuid' instead of throwing an error it allocates an instance IP object with instance-ip-addres='ip-address'.

[Babu Shanmugam (anbu-p)]

See https://review.opencontrail.org/#/c/2883

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/3606
Committed: http://github.org/Juniper/contrail-controller/commit/a269b011d91415a60deb19146e6c7f76f4ea5782
Submitter: Zuul
Branch: R1.10

commit a269b011d91415a60deb19146e6c7f76f4ea5782
Author: anbu <email address hidden>
Date: Mon Sep 15 12:56:38 2014 +0000

Fix to create instance ip from subnet-uuid.
Also modified the port_create function in vnc_opentstack to use this fix

Backported from the master branch

Closes-bug: #1369841

Change-Id: Id19efca8e0061a7564673b9e27ec3ba48172b00f